Once you activated the second bomb Cindy will askyou to go back to the imfermary and Denis (you) will ask aare Cindy and Sofia are ok, and Cindy will say she doesnt know where Sofia is and when you get to the door before you get to the imfermary sofia will be dead and she'll have the B card in her hand.
Denis (you) can get back over the Drawbridge when you get the B card Cindy will activate the Drawbridge and then you could go to the to the train then you fight a monster and you get the granade launcher
A2:
You go back through the lab lvl 2 and to the door where the lock is on it and your in lvl1 lab and go through the double doors on the base floor and go back to the drawbridge. -Answer by:rotinaj22
Q:How do you pass the water wall right after you leave the command center?
A1:
There is a pad that has arrows on it and a ladder on the roof that you can clicmb across. -Answer by:rotinaj22
A2:
Ok that is a bogus answer here is what he is asking and here's how bud you first turn on the switch to your right then run from a distance of course and just as your in the thick of the water like substance "h2o13" you knife the pipe emiting the co2 got it. That's all and your through.